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61200208L1-1 Express 5210 User Manual 5-1

Chapter 5

Applications

This chapter provides examples of some common Express 5210

data and voice applications. The data examples include SNA/

SDLC with local spoofing, transparent, and LAN applications. The

voice applications (which begin on page 5-9) include switched,

daisy-chaining, PLAR circuits, and direct FXS/FXO. The

configuration selections given in these examples may need

modification based on your network configuration.

DATA APPLICATIONS

SNA/SDLC with Local Spoofing

When used in an SNA/SDLC network, the Express 5210 provides

local spoofing by emulating the primary or secondary SDLC roles

(see Figure 5-1). The Express 5210 performs conversion from SDLC

to frame relay and also terminates SDLC links, providing primary

and secondary emulation between Express 5210s. Local spoofing

improves performance by reducing traffic across the frame relay

network and allows definite response times on the SDLC links.

To perform spoofing, the Express 5210 automatically sets itself up

to provide primary or secondary emulation based on the receipt of

SNRM (set normal response mode) from an SDLC device. The

Express 5210 looks for SNRM on all ports and assumes a secondary

role once SNRM is received. The Express 5210 then brings up the

LLC2 link across the frame relay network to another FRAD which

assumes a primary role. This allows the Express 5210 to operate

with PU 2.1 devices.

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ADTRAN 1204006L1 Manual de usuario Pagina 59